Apparatus for printing reticulated



May 13, 1939.

Filed July 14, 1927 WVf/VTUR Rodolphe Bert/Hon T OfM [Y Patent ed May 13, 1930 UNITED STATES- PATENT OFFICE nononrnn nnn'rnon, or NEUILLY, rmcn, ASSIGNOR, IBY MESNE nssromn'rs, 'ro soom'm FRAN'GAISE omnonnoma'rmun (rnoonnns n. Bnnrnon'), or rams,

FRANCE, A CORPORATION OF FRANCE APPARATUS FOR PRINTING RETICULAQED FILES Application filed July 14, 1927, Serial No. 205,786, and in France J'uly 28, 1926.

Films with refractive microscopic elements used for copying in colours by projection may like ordinary black and while films, be used either for printing positives from negatives or for printing counter-types similar to the original pictures if the latter were obtained through inversion.

Whatever the process adopted, new'prints are obtained by projecting an image bearing reticulated film on a blank reticulated film. Producing positives from ne atives is g'overned above all by the use of films with optically faultless lentioular elements. Producing inverted counter-types does not require so nice an accuracy, the optical defects of both films being, in principle, neutralized by the inverting operation v(or transformation of the negative into a positive).

The apparatus which is the object of this invention is particularly designed for obtaining countertypes on reticulated films, but may also be usefully employed for printing positives from negatives, or even simply for printing black and white countertypes.

The apparatus is, diagrammatically illustrated as an example, in the drawing append-' ed hereto, a vertical section thereof through the optical axis of the system being shown.

In the said drawing: V

A represents a filmeed device in which the film is fed from a spool-box a to a spool-box a the gate being indicated at I.

. B represents another such device in which the film is fed from a spool-box b to a spoolbox 6 the gate being indicated at 1 C is adifiuser. lantern, the back a of which is vividly illuminated by a I row of lamps c c" and diffuses light in all directions on the gate 1 of the film-feeding device A. I

D is an optical projecting system which may be constituted by one or more lenses but characterized by the two circumstances that its aperture must afford passage to a pencil of light the angle of which is at least equalv neutralize optically thenetwork of the film to the angle of aperture of the picture-taking fed past gate 1 It may, as shown, he a system of small-angled prisms. As will be understood, this optical device is intended to shift the light beam in the manner described in my prior application No. 122,989, filed July 16, 1926, and thereby neutralize the net of the original film so as to remove waterings.

F is a compensator lamp intended to produce a certain dimness or fog on the rear face of the blank film. In the course of the inverting operation, this-dimness or fog, decreases the absolute intensity of the image and, consequently its hardness. The intensity of the light emitted by this lamp is regulated according to theopacity of the film to be printed, by any device which will uniformly fog the blank film on the gelatino-bromide side.

The apparatusis operated as follows:

The film to be projected is placed in the spool-box a, the end of the strip being threaded through the apparatus and wound and said lamp may be replaced slightly inside spool-box a the film now be- I and, as with the film images of the film to be printed is projected through the objective D on the portion of the blank film visible at gate 1"". Focussing is then proceeded with arid the hardness of the image thus projected is observed, the intensity of the light from the'lamp F being accordingly adjusted. The greater the hardness of the projected image, the more powerful the illumination from lamp F must be. The apparatus is now operated for printing.

The diffuser lantern C requires no centering; it is sufficient to adjust the intensity of illumination to print in the best possible conditions.

Subject to fulfilling the above explained requirements as to aperture, the projection optical system D requires no other adjustfilms were available, the sensitized layer of which had previously been adjusted to the density of the images to be printed.

I claim as my invention: 1. Apparatus graphic films which are provided with nets of microscopic refractive elements for proection in colors,

such apparatus comprising separate feeding devices for the original film to be re roduced and for a blank film;- a source 0 light behind the ori 'nal film; optical devices between the two g for projecting the images of the original film upon the blank film; a device the aforesaid optical devices for shifting the luminous beam so as to neutralize the net of said original film and thereby remove waterings; and a compensating source of light behind the blank film for fogging the images in order to decrease their hardness after inver- S1011.

2. In apparatus for printing photo a bio films which are provided with nets of mi dro- "sc'opic refractive elements for projection in colors,'a feeding device for ablank fihn havmg a gate past which the film travels; and a compensating lamp arranged behind the feedng device in line with said gate for producmg a fog or mist on the gelatmo-bromide side of the film.

In testimony whereof I afiix m si ature. RODQLPHIE y gn BERTHON,

as if positive for reproducing photoeding devices I associated with 

